MC33388D datasheet(13/28 Pages) FREESCALE

tên linh kiện	MC33388D

Giải thích chi tiết về linh kiện	Fault Tolerant CAN Interface

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MC33388

Electromagnetic Compatibility

MC33388

MOTOROLA

13

Introduction

The device is designed for optimized noise emission (EMI)

and high susceptibility performances (EMC). The source for

both disturbance and susceptibility is primarily coming form the

bus line wires. They are by far the longest connections

compared to the printed circuit board of the application

receiving the MC333388, the microcontroller and the other

components.

EMI Noise

In order to minimize the HF noise generated by the

complete application, the MC33388 minimizes the common

mode voltage and current glitches occurring at each bus

transition : from dominant to recessive and from recessive to

dominant. This is achieves by excellent matching in signal

transition between CANL and CANH. The common mode

voltage and current glitches are defined as follow :

CmV = (Vcanh+Vcanl)/2,

CmI = (Icanh+Icanl)/2.

The device is optimized for dual wires operations. Under a

fault condition, for instance one CAN bus connection shorted to

fixed voltage, e.g GND, the common mode will be considerably

degraded.

Figure below shows the typical signals for common mode

voltage measured at CANL and CANH pins.

Figure 5. Typical Common Mode Glitch

Measured at CANL CANH

Tx: 5V/div

Common Mode

100mV/div

Glitch

NERR: 5V/div

CAUTION : The common mode voltage characteristics are

dependant upon immediate device environment, such as bus

capacitor loading, bus wire length and type, etc... In addition, the

symmetry of the CANL and CANH bus lines is key parameter to

optimize common mode glitches. For instance un-symmetry

could result in different parasitic capacitors value between

CANL to GND and CANH to GND and will increase common

mode glitches and degrade overall system performances.

EMC Susceptibility Performances

The MC33388 is optimized for high immunity from external

field disturbances. The bus lines are by far the primary antenna

for external field coupling to the CANL, CANH, Rtl and Rth

connections. The device performances are characterized using

the Bulk Current Injection (BCI) test method, derivated from

specification ISO 11452-4.

Susceptibility evaluation with BCI :

The component is configured according to the electrical

schematic very close to the typical application schematic, figure

4. Main difference is that the microcontroller is replaced by an

external generator and analyzer connected to RX, TX and

NERR through optical link. A network composed of two nodes

equipped with MC33388, one in emitter and one in receiver is

evaluated. The disturbance is applied to both CANL and CANH

twisted pair bus line lines with appropriate coupling clamp.

During test sequences, received bits are compared to

transmit bits. When received bits are different from transmit bits

the device is considered as fail for the particular frequency.

Results

Figures 7 and 8 below describe the device susceptibility

performances in the frequency range of 1 to 400MHz with target

of injected current of 200mA and 316mA.

When the target current is reached and when no

susceptibility is observed, the next frequency point is analyzed,

until reaching the max frequency, 400Mhz. If a susceptibility is

observed for a particular frequency, the free point is marked.

Figure 7 below shows results with a target susceptibility level

of 316mA or 49dBmA with a 1KHz 80% modulation added to the

injected current. Figure 8 shows the susceptibility levels with a

target susceptibility level of 200mA or 46dBmA without

modulation added to the injected current.

Figure 6. Min. Susceptibility Level With Modulation

1.0

10

100

1000

20

30

40

60

10

FREQUENCY (MHz)

50

LIMIT OF TEST (49dB) (No Susceptibility)

NO SUSCEPTIBILITY AREA

Susceptibility Points

Figure 7. Min. Susceptibility Level Without Modulation

1.0

10

100

1000

20

30

40

50

60

10

FREQUENCY (MHz)

NO SUSCEPTIBILITY AREA

46

Susceptibility Points

LIMIT OF TEST (46dB) (No Susceptibility)

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

Số phần tương tự - MC33388D

nhà sản xuất	tên linh kiện	bảng dữ liệu	Giải thích chi tiết về linh kiện
Motorola, Inc	MC33388D	454Kb / 28P	Fault Tolerant CAN Interface

More results

Mô tả tương tự - MC33388D

nhà sản xuất	tên linh kiện	bảng dữ liệu	Giải thích chi tiết về linh kiện
Motorola, Inc	MC33388	454Kb / 28P	Fault Tolerant CAN Interface
NXP Semiconductors	PCA82C252	112Kb / 20P	Fault-tolerant CAN transceiver 1997 Oct 28
NXP Semiconductors	TJA1053	113Kb / 20P	Fault-tolerant CAN transceiver 1997 Oct 15
Infineon Technologies A...	TLE6262G	809Kb / 38P	Fault Tolerant CAN - LDO version 2.03 2002-03-20
ON Semiconductor	AMIS-41682	270Kb / 16P	Fault Tolerant CAN Transceiver June, 2010 ??Rev. 8
NXP Semiconductors	TJA1054	146Kb / 25P	Fault-tolerant CAN transceiver Rev. 04-24 September 2009
AMI SEMICONDUCTOR	AMIS-4168X	625Kb / 18P	Fault Tolerant CAN Transceiver
NXP Semiconductors	TJA1054	124Kb / 20P	Fault-tolerant CAN transceiver 1999 Feb 11
ON Semiconductor	AMIS41682NGA	259Kb / 16P	Fault Tolerant CAN Transceiver June, 2010 ??Rev. 8
NXP Semiconductors	TJA1054A	152Kb / 27P	Fault-tolerant CAN transceiver Rev. 05-29 September 2009

More results

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